# coding:utf-8
'''
filename: roundfloat.py
'''
class RoundFloat:
    def __init__(self, val):
        assert isinstance(val, float), "value must be a float."
        self.value = round(val, 2)

    def __str__(self):    #①
        return "{:.2f}".format(self.value)

    __repr__ = __str__    #②

if __name__ == "__main__":
    r = RoundFloat(2.185)
    print(r)
    print(type(r))